US4299389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic chessboard with self-centering pieces
Assignee: Individual
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Filing: 1979-07-24
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Granted: 1981-11-10
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Expires: 1999-07-24
Abstract
Abstract Each square of a chessboard is centrally provided with a magnet, and each chess and/or draughts piece is provided with a permanent magnet. Because of the presence of the magnets, each piece is automatically centered in the square, toward which it is moved, without requiring any operation of "settling" and of possible taking back of the piece. Furthermore, each piece is secured against shocks or sudden movements of the chessboard.
Inventors
- 👤 Lino Miolo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:20
CPC Classifications
A; A63; A63F; A63F3/00; A63F3/00694; A63F3/00173; A63F3/00574; A63F2003/0063; A63F3/00697; A63F2003/007
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
110 words
A magnetic chessboard with self-centering pieces, said chessboard comprising a plurality of squares wherein each said square of the chessboard is provided with a cylindrical permanent magnet embedded in its center, each cylindrical permanent magnet of each square having a vertical geometrical axis and a magnetic axis with the same orientation in all of the squares, and each piece being provided with a cylindrical permanent magnet embedded in its base, each last-named permanent magnet having a geometrical axis parallel to said base and a magnetic axis parallel to the magnetic axes of the magnets of said squares whereby the self centering effect between the board and the pieces in enhanced.
Claim 2
Dependent Claim
110 words
A magnetic chessboard with self-centering pieces, said chessboard comprising a plurality of squares wherein each said square of the chessboard is provided with a cylindrical permanent magnet embedded in its center, each cylindrical permanent magnet of each square having a vertical geometrical axis and a magnetic axis with the same orientation in all of the squares, and each piece being provided with a cylindrical permanent magnet embedded in its base, each last-named permanent magnet having a geometrical axis parallel to said base and a magnetic axis parallel to the magnetic axes of the magnets of said squares whereby the self centering effect between the board and the pieces in enhanced.
Claim 3
Dependent Claim
24 words
A magnetic chessboard as defined in claim 1, and the magnetic axes of the magnets of each square and of each piece being vertical.
Claim 4
Dependent Claim
24 words
A magnetic chessboard as defined in claim 1, and the magnetic axes of the magnets of each square and of each piece being horizontal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-09 | 1985-05-11 | 1985-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-09 | 1989-05-11 | 1989-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-09 | 1993-05-11 | 1993-11-10 | $7700.00 | Window Closed / Lapsed |